4SQRP Bayou Jumper 40 Meter CW Transceiver, Assembly & Instruction Manual

Page: 46 / 47

revised 3 Feb 2021 Bayou Jumper revB Assembly Manual page 45 of 46
M. Measured values from a rev B, beta build Bayou Jumper
Tuning range:
Very tight 19 turn main winding
With C30 at maximum capacitance, initial range was 6813
– 6959 kHz
Adjusting C30, only, yielded the result below
Dial setting Rx zero beat frequency, kHz
0 7002.0
1 7004.3
2 7030.1
3 7063.3
4 7087.7
5 7107.8
6 7125.6
7 7142.6
8 7159.3
9 7162.0
Receive mode current draw (12.4 volt supply):
Key up, normal headphone volume: 24 mA
Key down (spotting mode): 71 mA
Transmit mode, idling current (12.4 V supply):
Key up: 17 mA
Transmit power measurements:
All voltages measured at the power jack, key down, 7120.1 kHz (7122 crystal)
V
supply
at power jack
RF output
Peak-peak volts
RF output
watts
Supply current
mA
PA efficiency
11.0 35.2 3.1 360 78%
12.0 38.4 3.7 395 78%
13.0 41.6 4.3 425 78%
14.0 44.0 4.8 455 81%
Fully charged 12 V,
7 A-hr AGM battery
40.8 4.2
3 x 18650 lithium-ion
cells, fully charged
38.4 3.7
Harmonic suppression measured with a Rigol spectrum analyzer:
All harmonics at least 50 dB below the fundamental